300 students were asked if they would be going on a trip over spring break. It was also record whether the student was a boy or a girl. Of the 300 students, 90 or not going on a trip. 120 of those recorded work girls. 170 boys are going on a trip.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)